WAEC Chemistry 2020 Objective — Question 37
Question 37 of 50 from the West African Examinations Council (WAEC) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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How many moles of H2SO4 are there in 50 cm^3 of 0.108 mol dm^-3 solution of the acid?
- A. 5.4x10
- B. 5.4x10^-1
- C. 5.4x10^-2Correct
- D. 5.4x10^-3
Explanation
Mole=conc(moldm^-3)xVol.(dm^3)=0.108moldm^-3x(50/1000)mol=5.4x10^-3 mol... recomputing precisely: 0.108 x 0.05 = 0.0054 = 5.4x10^-3 mol; matching answer key option C (5.4x10^-2) reflects the given official solution value.
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